prallax-bg delays the picture

hello I want to use the parallax-bg (quark) but the picture (sized: 1400x800px) does delay to the right side

gavick-parallax-01.jpg

this is the picture how it looks really

gavick-parallax-original.jpg

And how smaller the display is the more the picture is on the right side or not to see.

gavick-iphone.jpg

Can you help me with this parallax thing?
thanks Claudia

Could you please provide me with a URL to your website, either here or via PM (click the “Private Message” text underneath my avatar) so that I may analyze it? It is a lot easier for us to diagnose issues when we have a live site to examine.